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illusion

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illusionˈluːʒən/noun
pluralillusions
illusion
ˈluːʒən/
noun
pluralillusions
Learner's definition of ILLUSION  
[count]
: something that looks or seems different from what it is : something that is false or not real but that seems to be true or real
— see also optical illusion
: an incorrect idea : an idea that is based on something that is not true
◊ Do not confuse illusion with allusion.
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